---We're going for a picnic next Sunday, and I'd like you to join us.---____________!I have to see my grandmother. She has been ill for two weeks.
It was 4 o'clock when the front doorbell rang. Mrs. Clarke was __________ tea at the time.
The general asked his men to push _____ so they might overtake the retreating (败退的) enemy troop.
However, it only appears in the imagination and will never be __________.
At the beginning, I had some difficulty with my English, and my teacher pulled me ______.
Washington D.C. ______ between Virginia and Maryland on the Potomac River. A. lays. B. lies C. sits D. seats